A nozzle assembly for carbon dioxide snow cleaning

Abstract

The utility model discloses a nozzle assembly for carbon dioxide snow cleaning, which comprises a spray seat, a carbon dioxide inlet connecting hole, an auxiliary gas inlet hole and a spray connecting hole are arranged on the spray seat, and a first channel and a second channel are further arranged in the spray seat; a carbon dioxide inlet joint is detachably connected with the carbon dioxide inlet connecting hole; a nozzle is detachably connected with the spray connecting hole at one end, and a spray hole is arranged at the other end of the nozzle; a core pipe is arranged in the first channel and the spray channel, and an auxiliary gas ejection gap is arranged between the core pipe and the inner wall of the spray hole. Liquid carbon dioxide enters from the carbon dioxide inlet joint and is converted into carbon dioxide snow particles in the carbon dioxide conversion channel in the core pipe, which are sprayed out; the auxiliary gas flows from the outside of the core pipe to the spray channel of the nozzle, and the carbon dioxide snow particles sprayed out by the core pipe are shot at the surface of the object to be cleaned by the auxiliary gas. The nozzle assembly has a simple structure and is easy to process, assemble, use and maintain.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide snow cleaning technology, and in particular to a nozzle assembly for carbon dioxide snow cleaning. Background Technology

[0002] Carbon dioxide snow cleaning technology, as an environmentally friendly and pollution-free cleaning method, is widely used in industrial cleaning, mold decontamination, and other fields. Its principle is to use high-speed jets of carbon dioxide snow particles to remove surface dirt through kinetic energy impact and sublimation. Currently, some carbon dioxide snow cleaning equipment works by introducing liquid carbon dioxide into a nozzle, where it solidifies to form carbon dioxide snow microparticles, which are then sprayed out. However, existing nozzle structures are relatively complex, making manufacturing and maintenance difficult. Those skilled in the art desire a carbon dioxide snow cleaning nozzle with a simpler structure that is easier to manufacture and maintain. Utility Model Content

[0003] The main objective of this invention is to propose a nozzle assembly for carbon dioxide snow cleaning, aiming to solve the technical problem of the complex structure of existing carbon dioxide snow cleaning nozzles.

[0004] To achieve the above objectives, this utility model proposes a nozzle assembly for carbon dioxide snow cleaning, comprising:

[0005] The spray holder is provided with a carbon dioxide inlet connection hole, an auxiliary gas inlet hole and an injection connection hole. The spray holder is also provided with a first channel and a second channel. The carbon dioxide inlet connection hole is directly opposite the injection connection hole. The first channel connects the carbon dioxide inlet hole and the injection connection hole. The first channel is provided with a first air inlet hole. The second channel connects the auxiliary gas inlet hole and the first air inlet hole.

[0006] A carbon dioxide inlet connector is detachably connected to the carbon dioxide inlet connection hole. The carbon dioxide inlet connector has a carbon dioxide inlet channel inside, and one end of the carbon dioxide inlet connector located in the first channel has an inlet interface.

[0007] A nozzle, one end of which is detachably connected to the spray connection hole, and the other end of which is provided with a spray hole. The nozzle is provided with a spray channel, and the spray channel is connected to the first channel.

[0008] The core tube is disposed within the first channel and the injection channel. One end of the core tube is connected to the inlet interface. A carbon dioxide conversion channel is provided inside the core tube, which is connected to the carbon dioxide inlet channel. The other end of the core tube is disposed in the middle of the nozzle and has an auxiliary gas ejection gap between it and the inner wall of the nozzle.

[0009] The carbon dioxide inlet connector is installed on the spray holder through the carbon dioxide inlet connection hole. The core tube is connected to the inlet interface of the carbon dioxide inlet connector, and the nozzle is installed on the spray holder through the spray connection hole. During operation, liquid carbon dioxide enters through the carbon dioxide inlet connector and flows into the carbon dioxide conversion channel within the core tube. In the carbon dioxide conversion channel, the liquid carbon dioxide is converted into carbon dioxide snow particles and sprayed out. Simultaneously, auxiliary gas enters the second channel through the auxiliary gas inlet hole of the spray holder, and then enters the first channel through the first inlet hole. The auxiliary gas flows from the outside of the core tube to the spray channel of the nozzle, and then is sprayed out through the auxiliary gas spray gap. The auxiliary gas carries the carbon dioxide snow particles sprayed from the core tube and propels them onto the surface of the object to be cleaned. This nozzle assembly has a simple structure and is easy to manufacture, assemble, use, and maintain.

[0010] Preferably, the nozzle is provided with a retainer, the outer side of the retainer is connected to the nozzle, the middle part of the retainer is provided with a retaining hole, the core tube passes through the retaining hole, the retaining hole can support and position the core tube, the retainer is provided with an air passage hole, the air passage hole is located on the outer side of the retaining hole, and the injection channel includes the air passage hole.

[0011] The core tube passes through a retaining hole in the middle of the holder. This retaining hole supports and positions the core tube near the nozzle, keeping it in the center of the spray channel to prevent it from shifting and affecting the cleaning effect of the carbon dioxide snow spray. The holder has an air passage, allowing auxiliary gas to pass through without affecting its flow. Furthermore, because the cross-sectional area of ​​the air passage is smaller than that of the spray channel, it acts as a throttling device, increasing the gas pressure and allowing the auxiliary gas to provide greater kinetic energy to the carbon dioxide snow particles.

[0012] Preferably, the inlet includes a connecting needle, which is detachably connected to the carbon dioxide inlet connector, and the end of the core tube is sleeved and fixed to the outside of the connecting needle.

[0013] Liquid carbon dioxide can enter the connecting needle and then the core tube. The connecting needle can be detachably connected to the carbon dioxide inlet connector. The end of the core tube is then fitted and fixed to the outside of the connecting needle, which makes it easy to replace the core tube and the connecting needle.

[0014] Preferably, the nozzle assembly further includes a first compression ring, which is sleeved on the outside of the core tube and the connecting needle, and the first compression ring can compress and fix the core tube and the connecting needle inward.

[0015] After the core tube is fitted onto the connecting needle, a first compression ring is fitted around the outside of the core tube and the connecting needle. The first compression ring presses the core tube inward onto the connecting needle, improving the reliability of the fixation between the core tube and the connecting needle.

[0016] Preferably, a connecting pipe is provided between the nozzle and the spray connection hole, one end of the connecting pipe is detachably connected to the spray connection hole, and the nozzle is detachably connected to the connecting pipe.

[0017] The adapter tube connects to the spray connection hole, and the nozzle connects to the adapter tube. By using adapter tubes of different lengths, the distance between the nozzle and the spray base can be changed, which can easily adapt to core tubes of different lengths.

[0018] Preferably, the adapter pipe is threaded to the injection connection hole, the adapter pipe is threaded to the nozzle, and the carbon dioxide inlet connector is threaded to the carbon dioxide inlet connection hole.

[0019] Preferably, the jet channel has a tapered jet contraction section on the side near the nozzle, and the jet contraction section is configured to contract toward one side of the nozzle.

[0020] When the auxiliary gas flows to the jet contraction section, it is compressed to form a high-pressure airflow, which constrains the carbon dioxide snow particles formed at the output port of the core tube to achieve a clustering effect, making the carbon dioxide snow particles in the jet more concentrated, increasing the number of impacts on the cleaning target, and improving the cleaning effect and accuracy.

[0021] Preferably, the carbon dioxide conversion channel is provided with a conical conversion contraction section and a conversion expansion section. The conversion contraction section is located on the side of the conversion expansion section near the carbon dioxide inlet connector. The conversion contraction section contracts towards the side closer to the conversion expansion section, and the conversion expansion section expands away from the conversion contraction section.

[0022] When liquid carbon dioxide passes through the conversion contraction section, it cools down and its pressure decreases. Then, when it enters the conversion expansion section, the flow rate decreases and the pressure increases. This makes it easier for liquid carbon dioxide to be converted into solid, thereby forming more solid particles with cleaning capabilities and enhancing the cleaning effect.

[0023] Preferably, a shrinkage-expansion member is inserted into the carbon dioxide conversion channel, the conversion shrinkage section and the conversion expansion section are disposed inside the shrinkage-expansion member, and a second compression ring is sleeved on the core tube. The second compression ring is sleeved on the outside of the core tube and the shrinkage-expansion member, and the second compression ring can compress and fix the core tube and the shrinkage-expansion member inward.

[0024] The conversion shrinkage section and conversion expansion section are set inside the shrinkage expansion member, and then the shrinkage expansion member is inserted into the core tube. This reduces the difficulty of machining the conversion shrinkage section and conversion expansion section on the core tube. The second extrusion ring is used to press the outer side of the core tube and the shrinkage expansion member to prevent the shrinkage expansion member from shifting inside the core tube.

[0025] Preferably, the carbon dioxide inlet channel is provided with a throttling orifice. When liquid carbon dioxide passes through the throttling orifice, it can play a role in throttling and stabilizing the pressure, thereby reducing the conversion of liquid carbon dioxide into gaseous state when it enters the carbon dioxide conversion channel, stabilizing the conversion conditions and conversion efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is an exploded structural diagram of the present invention;

[0029] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0031] Figure 5 for Figure 3 A magnified view of a section at point B in the middle;

[0032] Figure 6 This is a schematic diagram of the structure of the retainer in the nozzle of this utility model.

[0033] In the attached diagram: 1-spray base, 11-carbon dioxide inlet connection hole, 12-auxiliary gas inlet hole, 13-injection connection hole, 14-first channel, 141-first air inlet hole, 15-second channel, 2-carbon dioxide inlet connector, 21-carbon dioxide inlet channel, 211-throttle hole, 22-inlet interface, 221-connecting needle, 222-first compression ring, 3-nozzle, 31-spray hole, 32-injection channel, 321-jet contraction section, 33-auxiliary gas ejection gap, 34-cage, 341-cage hole, 342-exhaust hole, 4-core tube, 41-carbon dioxide conversion channel, 42-contraction expansion component, 421-conversion contraction section, 422-conversion expansion section, 43-second compression ring, 5-adapter pipe.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] like Figures 1 to 6 As shown, a nozzle assembly for carbon dioxide snow cleaning includes a spray base 1, a carbon dioxide inlet connector 2, a nozzle 3, and a core tube 4.

[0039] The spray holder 1 is provided with a carbon dioxide inlet connection hole 11, an auxiliary gas inlet hole 12 and an injection connection hole 13. The spray holder 1 is also provided with a first channel 14 and a second channel 15. The carbon dioxide inlet connection hole 11 is directly opposite the injection connection hole 13. The first channel 14 connects the carbon dioxide inlet connection hole 11 and the injection connection hole 13. The first channel 14 is provided with a first air inlet hole 141. The second channel 15 connects the auxiliary gas inlet hole 12 and the first air inlet hole 141.

[0040] The carbon dioxide inlet connector 2 is detachably connected to the carbon dioxide inlet connection hole 11. The carbon dioxide inlet connector 2 is provided with a carbon dioxide inlet channel 21, and one end of the carbon dioxide inlet connector 2 located in the first channel 14 is provided with an inlet interface 22.

[0041] One end of the nozzle 3 is detachably connected to the spray connection hole 13, and the other end of the nozzle 3 is provided with a spray hole 31. The nozzle 3 is provided with a spray channel 32, which is connected to the first channel 14.

[0042] The core tube 4 is located in the first channel 14 and the injection channel 32. One end of the core tube 4 is connected to the inlet interface 22. The core tube 4 is provided with a carbon dioxide conversion channel 41, which is connected to the carbon dioxide inlet channel 21. The other end of the core tube 4 is located in the middle of the nozzle 31 and is provided with an auxiliary gas ejection gap 33 between it and the inner wall of the nozzle 31.

[0043] The carbon dioxide inlet connector 2 is installed on the spray base 1 through the carbon dioxide inlet connection hole 11, the core tube 4 is connected to the inlet interface 22 of the carbon dioxide inlet connector 2, and the nozzle 3 is installed on the spray base 1 through the spray connection hole 13.

[0044] During operation, liquid carbon dioxide enters through the carbon dioxide inlet connector 2 and flows into the carbon dioxide conversion channel 41 within the core tube 4. Within the carbon dioxide conversion channel 41, the liquid carbon dioxide is converted into carbon dioxide snow particles and ejected. Simultaneously, auxiliary gas enters the second channel 15 through the auxiliary gas inlet 12 of the spray base 1, and then enters the first channel 14 through the first inlet 141. The auxiliary gas flows from the outside of the core tube 4 to the injection channel 32 of the nozzle 3, and then is ejected from the auxiliary gas ejection gap 33. The auxiliary gas carries the carbon dioxide snow particles ejected from the core tube 4 and propels them onto the surface of the object to be cleaned. This nozzle assembly has a simple structure and is easy to manufacture, assemble, use, and maintain.

[0045] In some specific embodiments, reference is made to Figure 6The nozzle 3 is provided with a retainer 34, the outer side of which is connected to the nozzle 3. The retainer 34 is provided with a retaining hole 341 in the middle. The core tube 4 passes through the retaining hole 341, which can support and position the core tube 4. The retainer 34 is provided with an air passage 342, which is located on the outer side of the retaining hole 341. The injection channel 32 includes the air passage 342.

[0046] The core tube 4 passes through the retaining hole 341 in the middle of the retainer 34. The retaining hole 341 supports and positions the side of the core tube 4 closest to the nozzle 3, keeping the core tube 4 in the middle of the injection channel 32 to prevent it from shifting and affecting the carbon dioxide snow spraying cleaning effect. The retainer 34 is provided with an air passage 342, through which auxiliary gas can pass without affecting its flow and ejection. Moreover, since the cross-sectional size of the air passage 342 is smaller than that of the injection channel 32, when the auxiliary gas passes through the air passage 342, the air passage 342 acts as a throttling device, increasing the gas pressure and allowing the auxiliary gas to provide greater kinetic energy to the carbon dioxide snow particles. Preferably, there are two or more air passages 342, evenly distributed circumferentially along the retaining hole 341.

[0047] In some specific embodiments, reference is made to Figure 4 The inlet interface 22 includes a connecting needle 221, which is detachably connected to the carbon dioxide inlet connector 2. The end of the core tube 4 is sleeved and fixed to the outside of the connecting needle 221.

[0048] Liquid carbon dioxide can enter the connecting needle 221 and then the core tube 4. The connecting needle 221 is detachably connected to the carbon dioxide inlet connector 2, and the end of the core tube 4 is then sleeved and fixed to the outside of the connecting needle 221, which facilitates the replacement of the core tube 4 and the connecting needle 221. Furthermore, the connecting needle 221 is threadedly connected to the carbon dioxide inlet channel 21, which facilitates the installation and removal of the connecting needle 221.

[0049] Furthermore, the nozzle assembly also includes a first compression ring 222, which is sleeved on the outside of the core tube 4 and the connecting needle 221. The first compression ring 222 can compress and fix the core tube 4 and the connecting needle 221 inward.

[0050] After the core tube 4 is fitted onto the connecting needle 221, the first compression ring 222 is fitted onto the outside of the core tube 4 and the connecting needle 221. The first compression ring 222 can generate an inward contraction force, which inwardly compresses the core tube 4 onto the connecting needle 221, thereby improving the reliability of the fixation between the core tube 4 and the connecting needle 221.

[0051] In some specific embodiments, a connecting pipe 5 is provided between the nozzle 3 and the spray connection hole 13, one end of the connecting pipe 5 is detachably connected to the spray connection hole 13, and the nozzle 3 is detachably connected to the connecting pipe 5.

[0052] The adapter tube 5 is connected to the spray connection hole 13, and the nozzle 3 is connected to the adapter tube 5. By using adapter tubes 5 of different lengths, the distance between the nozzle 3 and the spray base 1 can be changed, which can easily adapt to core tubes 4 of different lengths.

[0053] Furthermore, the adapter pipe 5 is threaded to the injection connection hole 13, the adapter pipe 5 is threaded to the nozzle 3, and the carbon dioxide inlet connector 2 is threaded to the carbon dioxide inlet connection hole 11, which can easily achieve detachable connection.

[0054] In some specific embodiments, the jet channel 32 is provided with a tapered jet contraction section 321 on the side near the nozzle 31, and the jet contraction section 321 is contracted toward one side of the nozzle 31.

[0055] When the auxiliary gas flows to the jet contraction section 321, it is compressed to form a high-pressure airflow, which constrains the carbon dioxide snow particles formed at the output port of the core tube 4 to achieve a clustering effect, making the carbon dioxide snow particles in the jet more concentrated, increasing the number of impacts on the cleaning target, and improving the cleaning effect and accuracy.

[0056] In some specific embodiments, reference is made to Figure 5 The carbon dioxide conversion channel 41 is provided with a conical conversion contraction section 421 and a conversion expansion section 422. The conversion contraction section 421 is located on the side of the conversion expansion section 422 that is close to the carbon dioxide inlet connector 2. The conversion contraction section 421 contracts towards the side that is close to the conversion expansion section 422, and the conversion expansion section 422 expands away from the conversion contraction section 421.

[0057] The conversion contraction section 421 and conversion expansion section 422 have a Laval-like structure. According to Bernoulli's principle, when liquid carbon dioxide flows through the conversion contraction section 421 and the throat, the flow velocity increases and the pressure decreases, and the Joule-Thomson effect causes the fluid temperature to drop. When liquid carbon dioxide instantaneously flows into the conversion expansion section 422, the flow velocity decreases and the pressure increases. At this time, since the fluid does no work, the temperature does not change. According to the three-phase conversion diagram of carbon dioxide, when the temperature of liquid carbon dioxide drops below -56.6℃, the pressure increases instantaneously, causing it to directly convert from liquid to solid, forming carbon dioxide snow particles. The liquid carbon dioxide experiences cooling and pressure reduction when passing through the conversion contraction section 421, and then the flow velocity decreases and pressure increases when entering the conversion expansion section 422. This makes it easier for liquid carbon dioxide to convert into solid, thereby forming more solid particles with cleaning capabilities and enhancing the cleaning effect.

[0058] Furthermore, a shrinkage-expansion member 42 is inserted into the carbon dioxide conversion channel 41, and a conversion shrinkage section 421 and a conversion expansion section 422 are disposed inside the shrinkage-expansion member 42. A second compression ring 43 is sleeved on the outer side of the core tube 4 and the shrinkage-expansion member 42. The second compression ring 43 can compress and fix the core tube 4 and the shrinkage-expansion member 42 inward.

[0059] The conversion shrinkage section 421 and conversion expansion section 422 are disposed within the shrinkage expansion member 42, and then the shrinkage expansion member 42 is inserted into the core tube 4. This reduces the difficulty of machining the conversion shrinkage section 421 and conversion expansion section 422 on the core tube 4. The second extrusion ring 43 presses against the outer side of the core tube 4 and the shrinkage expansion member 42. The second extrusion ring 43 can generate an inward shrinkage force to prevent the shrinkage expansion member 42 from shifting within the core tube 4.

[0060] In some specific embodiments, a throttling orifice 211 is provided in the carbon dioxide inlet channel 21. When liquid carbon dioxide passes through the throttling orifice 211, it can play a role in throttling and stabilizing pressure, so that the liquid carbon dioxide is reduced from being converted into gaseous state when it enters the carbon dioxide conversion channel 41, thereby stabilizing the conversion conditions and conversion efficiency.

[0061] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A nozzle assembly for carbon dioxide snow cleaning, characterized in that, include: The spray holder (1) is provided with a carbon dioxide inlet connection hole (11), an auxiliary gas inlet hole (12) and an injection connection hole (13). The spray holder (1) is also provided with a first channel (14) and a second channel (15). The carbon dioxide inlet connection hole (11) is directly opposite the injection connection hole (13). The first channel (14) connects the carbon dioxide inlet connection hole (11) and the injection connection hole (13). The first channel (14) is provided with a first air inlet hole (141). The second channel (15) connects the auxiliary gas inlet hole (12) and the first air inlet hole (141). A carbon dioxide inlet connector (2) is detachably connected to the carbon dioxide inlet connection hole (11). The carbon dioxide inlet connector (2) is provided with a carbon dioxide inlet channel (21). One end of the carbon dioxide inlet connector (2) located in the first channel (14) is provided with an inlet interface (22). The nozzle (3) has one end detachably connected to the spray connection hole (13), and the other end of the nozzle (3) is provided with a spray hole (31). The nozzle (3) is provided with a spray channel (32), and the spray channel (32) is connected to the first channel (14). The core tube (4) is located in the first channel (14) and the injection channel (32). One end of the core tube (4) is connected to the inlet interface (22). The core tube (4) is provided with a carbon dioxide conversion channel (41) and is connected to the carbon dioxide inlet channel (21). The other end of the core tube (4) is located in the middle of the nozzle (31) and is provided with an auxiliary gas ejection gap (33) between it and the inner wall of the nozzle (31).

2. The nozzle assembly as claimed in claim 1, characterized in that, The nozzle (3) is provided with a retainer (34), the outer side of the retainer (34) is connected to the nozzle (3), the middle part of the retainer (34) is provided with a retaining hole (341), the core tube (4) passes through the retaining hole (341), the retaining hole (341) can support and position the core tube (4), the retainer (344) is provided with an air passage hole (342), the air passage hole (342) is located on the outer side of the retaining hole (341), and the injection channel (32) includes the air passage hole (342).

3. The nozzle assembly as claimed in claim 1, characterized in that, The inlet interface (22) includes a connecting needle (221), which is detachably connected to the carbon dioxide inlet connector (2), and the end of the core tube (4) is sleeved and fixed to the outside of the connecting needle (221).

4. The nozzle assembly as claimed in claim 3, characterized in that, The nozzle assembly further includes a first compression ring (222), which is sleeved on the outside of the core tube (4) and the connecting needle (221). The first compression ring (222) can compress and fix the core tube (4) and the connecting needle (221) inward.

5. The nozzle assembly as claimed in claim 1, characterized in that, A connector (5) is provided between the nozzle (3) and the injection connection hole (13). One end of the connector (5) is detachably connected to the injection connection hole (13), and the nozzle (3) is detachably connected to the connector (5).

6. The nozzle assembly as claimed in claim 5, characterized in that, The adapter (5) is threaded to the injection connection hole (13), the adapter (5) is threaded to the nozzle (3), and the carbon dioxide inlet connector (2) is threaded to the carbon dioxide inlet connection hole (11).

7. The nozzle assembly as claimed in claim 1, characterized in that, The jet channel (32) has a tapered jet contraction section (321) on one side near the nozzle (31), and the jet contraction section (321) is tapered toward one side of the nozzle (31).

8. The nozzle assembly as claimed in claim 1, characterized in that, The carbon dioxide conversion channel (41) is provided with a conical conversion contraction section (421) and a conversion expansion section (422). The conversion contraction section (421) is located on the side of the conversion expansion section (422) closer to the carbon dioxide inlet connector (2). The conversion contraction section (421) contracts towards the side closer to the conversion expansion section (422), and the conversion expansion section (422) expands away from the conversion contraction section (421).

9. The nozzle assembly as claimed in claim 8, characterized in that, The carbon dioxide conversion channel (41) is provided with a shrinkage expansion member (42), the conversion shrinkage section (421) and the conversion expansion section (422) are located inside the shrinkage expansion member (42), the core tube (4) is covered with a second compression ring (43), the second compression ring (43) is sleeved on the outside of the core tube (4) and the shrinkage expansion member (42), and the second compression ring (43) can squeeze and fix the core tube (4) and the shrinkage expansion member (42) inward.

10. The nozzle assembly as claimed in claim 1, characterized in that, The carbon dioxide inlet channel (21) is provided with a throttling orifice (211).

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